Door latch



y 4July 2s, 1931.

Filed Aug. 9. 1928 ATTORNEY 5 f' mm 1s lz L Pq WITNESSES Patented July 28,1931

PATENT FFCE DAVID WILSON WOOD, F BRAZIL, INDIANA DOOR LATCH Application filed August 9, 1928. Serial No. 298,537.

` -This invention relates'to locks and latches.

It isr an obj ect of the invention to provide an improved device of this character, the operation of which may be controlled from the in- 4`5 side, thus preventing unauthorized use.

A further object of the invention isv to provide a device of the character described in which a bolt is provided normally controlled by an outside handle, means being provided 10 however, for retaining the bolt in either eX- tending or withdrawn position; ,a former means being controlled from within.

Other objects of the invention include the improvedy structure and the combinationand 15 interrelation of parts whereby the whole forms an efficient device which will be simple in construction and operation, and which will be inexpensive to manufacture.

With these and other objects in view, reference may be had to the specification and the drawings, in whichy Fig. 1 is a longitudinal vertical section of one form of my present invention. Y Fig. 2 is a vertical sectionv taken on the line 2-2 of Fig. 1. f f

Fig. 8 is a horizontalsection taken on the lines 8-8'of Fig. 1, and showing by the lines 1-1 the section lines of the Fig. 1.

Fig. 4 is a detailed view illustrating one feature of the operation of the invention.

Fig. 5 is a similar view of another feature of the invention. p l

Referring more particularly to the drawings, there is provided a casing within which there is positioned a sliding spring pressed bolt 11 normally urged outwardly by the expansion spring 12 which is receivable within an aperture 14 of the bolt 11. A projection 15 is provided in the rear wall 16 of the casing-10 about which the spring 12 is secured for holding it in properr alignment with respect to the bolt 11. Vhen in extended position, the bolt 11 is adapted to be received within va keeper chamber 18. By referring to Fig. 8 it will be noted that the extending portion of the bolt 11 is bev- 'elledas at 19 to conform kwith a similar bevel of the wall of the keeper 18; thus, as the bolt is forced outwardly by the action of the spring 12, a camming action takes place between the bolt and the keeper 18 holding the closure carrying the casing 10 in abutment with the keeper wall 20. The alignment of the bolt 11 with respect to the casing 10 and the keeper 18 is provided by a vertical trans- '55 versely extending wall 21 apertured as at 22 to receive therethrough the bolt 11. The bolt is also maintained in alignment by an aperture 28 in the front Wall 24 of the casing 10 through which itis adapted to pass.

For manually controlling the movement of the bolt from the outside there is provided a handle 25 adapted to rotate a transversely extending shaft 26'; rotation of which is adapted to move a bifurcated actuating member 27, the bifurcated ends of which form operating ingers 28 and 29. The actuating ingers'28 and 29 are adapted to coact with a projecting lug 8O extending from one side of the bolt 11. It may readily be seen that by rotation of the handle 25 in a counterclockwise direction, the finger 28 coacts with the lug 80, moving the bolt 11 against the tension of the spring 12 and withdrawing the extremity of the bolt from the keeper 18. It may also be seen that the reverse action of the handle 25 causes finger 29 of the actuating member 27 to engage the lug 80 for extending the bolt into the keeper. This action is assisted by the pressure exerted from the expansion spring 12.

Referring more'particularly to Fig, 4 for retaining the bolt in the withdrawn position against the tension of the spring 12, thereis provided a notch 81 in the upper surface of 85 the bolt 11. Directly over the bolt a casing is provided with a cylinder 82 within which an expansion spring 88 is provided normally urging downwardly a piston 84, the outer base of which is inclined as at and 90 is also provided with a recess 86. For main- 'taining the piston 84 in the position yilluslarged as at 89 to provide a shoulder 40 against which an expansion spring 41 abuts l to hold the slanting surface of the head 89 00 Y 'sa -L position, and the bolt 11 is thus free to move in and out of the keeper 18 under the action of the handle 25. lf however, when the bolt is withdrawn, the door is open, the piston-37'4 is free to move outwardly due tothe camming action of the adjacent bevelledsurfaces ofthe pistons 34 and 37.

The piston 34 thus moves downwardly to assume the position shown in'Fig. 4. nThe notch 86 of the head engages the notchv 31 in the upper surface of the bolt 11, thus retaining the bolt in its withdrawn position againstthe tension of the spring 12. It may be readily seen that upon closing the door, the pin 42 forces inwardly the piston 37, a reverse camming action taking place between the bevelled surfaces, and the piston 37 thus moves upwardly the piston 34 against the tension'. of its spring 33 and releases the notch 31 of the bolt 11 and'permits the bolt to be forced outwardly to be received within Y the keeper Y16 under Iinfluence of the spring 12.

For clogging the bolt 11 in operative or inoperative positionv from the inside, which is the side opposite the handle 25, there is provided a lug v44 on the bolt 11-on the side opposite the lug V30` and preferably positionedadjacent ,the spring end of the bolt. The bolt 11 is adapted to be retained inits Vwithdrawn position by a linger 45 carried by a pivotedr actuating arm" 46. By referring to Fig.. 5, it will be'noted that the full line position ofV the arm 46 illustrates -the position of lthe arm`- and finger 35 for retaining the-bolt 11 inv thev withdrawn position against the tension .of a spring 12.

The arm 46 is preferably journalled upon a projection 47 of one side wall ofthe casinglO. Adjacent itsjournalling aperture, thearm 46 is provided Vwith an extending pin /48 which is adapted to be received through an lelongated slot 49 carried'by a pivotedfstoparm which may preferably be ljournallefd uponaprojecting lug 51 of the back wall 16 of the casing10.v It may be readily seen thatupon clockwise motion of 'th-e' arm 46,"tl1e pin V48 moves upwardly, thus moving in counter-clockwise upward movement 'the stop arm 50, whereby Va projectingbevel 52 thereof is moved upwardly and allows the free inward-'movement ofthe bolt 11. Atthe same tima-the linger 45 ofthe arm 46 cams/the lug-344 inwardly, thus `moving thebolt 11 injagain'st the tension of the spring 12.

It-may-thusbeseen that the bolt 11 may kbe withdrawn bythe handle 25V when thearm thus prei/'eating inward movement thereof.

lt may thus readily be seen that the invention provides for a novel and improved latch member particularly adaptable for automobiles or the like, wherein it is desired to provide an outer-operating handlewithlloelring means controlled*fromI the Yinsideg ,It :will-V be understood that numerous lchanges,and .modiiications of the inventionymay` be `resorted to without departing from '-theaspir'it.AV or scope of thek vappended claims.

lclaim: ,y 1.: Jrfdevice of thelcharacteri-described, comprising acasing, a spring urgedbolt movablewithin said casing, agprojectionon ene side 4of said?` :bolt1neans1-associated with said projection for mQVingsaid vbolt .rectilinearly, api-ejection onfthe opposite sideof said belt, a pivoted .arm adapted 4toengage said vlast mentioned projection to move. said bolt within said casing, a pivotedflatchrmovable by said arm to prevent inwardmovement of said bolt, said bolt further. including a recess in rits upper surface, a spring urged plunger to engage said recess to lpreyrfent outward movement of saidboltfrom saidasing, and a secondplunger movablev at substantially right angleswith respect to said first mentioned plunger tol cam-,saidplunger .away from said bolt. j i 2. Av` device of the character .-described, comprising a casing, a springqurgedbolt movable within said casing, ayprojectionon one side of said bolt, means associated. with said projection for moving vsaid bolt,recti linearly, projectionk on the opposite side of said bolt, a pivoted arm adapted. to enga-ge said last-mentionedprojectiony to movefsaid bolt withinr said casing, a pivoted latch movable by said arm to prevent.inwardmovement of said bolt, said bolt further including a recess in its upper surface,..a. spring-urged plunger to engage saidrecess to prevent outward movement of said bolt from. said casing, and a second plunger to cam saidfplunger .away from said bolt, said .-last-mentioned plungerincluding a stem extendingoutwardly from said casing to be engaged bya door structure whereby said boltwill releasethe first-mentioned plunger by movement ofthe casing within the door structure.

DAVlD WILSON WOOD, 

